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Q579. The emission methods for dehydrator vents with daily throughputs less than 0.4 MMscfd in the preamble (use flow rate of wet natural gas and emission factor) contradict the requirements in the rule (use dehydrator count and emission factor).{longname}

A579.

...

Reporters

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with

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dehydrators

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with

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annual

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average

...

daily

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throughputs

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less

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than

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0.4

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million

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standard

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cubic

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feet

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per

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day

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(MMscfd)

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must

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count

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the

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total

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number

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of

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such

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dehydrators

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and

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apply

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an

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emission

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factors,

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as

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provided

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in

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§98.233(e)(2)

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and

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Equation

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W-5,

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to

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estimate

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emissions.

...

Where

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inconsistencies

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occur,

...

rule

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language

...

supersedes

...

preamble

...

language.

...

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Source: EPA, Frequently Asked Questions, Petroleum and Natural Gas Systems, July 2011, [http://www.epa.gov/climatechange/emissions/downloads11/documents/Subpart-W-additional-faq.pdf]. Clarified

Approval / Publishing History: Version 1, Approved by M. Eaddy, 6/4/2012

Expiration : none

Relevant Subpart: W, Dehydrators
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